Table 3 Changes in the dPD of M1s and M2s in participants with neighboring N-M3s (N = 26) in response to N-M3 removal and clinical periodontal indexes of M1s and M2s in participants without neighboring M3s (N = 28)

From: Removal of nonimpacted third molars alters the periodontal condition of their neighbors clinically, immunologically, and microbiologically

Groups

Teeth

dPD/mm (mean ± SD)

Pb

(M2s)

M1s

M2s

N-M3s (+)

T0

26

2.69 ± 0.47

3.65 ± 0.85

<0.001

Pa

 

0.598

<0.001

 

T1

26

2.58 ± 0.52

2.83 ± 0.51

0.074

Pa

 

0.242

0.053

 

P1

 

NS

<0.001

 

T2

26

2.54 ± 0.37

2.54 ± 0.51

0.888

Pa

 

0.043

0.956

 

P2

 

NS

<0.001

 

M3s (−)

 

28

2.73 ± 0.40

2.55 ± 0.39

0.040

  1. Note: M2s, second molars; N-M3s, nonimpacted third molars; M3s, third molars; N-M3s (+), M2s with neighboring N-M3s; M3s (−), M2s without neighboring M3s.
  2. dPD, mean probing depth of distobuccal and distolingual sites.
  3. T0, baseline; T1, 3 months after M3 extraction; T2, 6 months after M3 extraction.
  4. SD, standard deviation; Pa, compared between N-M3s (−) and N-M3 (+) (T0, T1, or T2); Pb, compared within the same period; P1, compared between T0 and T1; P2, compared between T0 and T2; P1 and P2 values were adjusted for multiple comparisons by the Bonferroni correction; NS, no significance; because the dPD showed no significant change among T0–T2, pairwise comparisons were not conducted between T0 and T1 (or T0 and T2); the significance value was set at 0.05.
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